Study	Reason for exclusion
Attwood 1992	No data about gender were given
Bauwens 1998	Only 56% of the sample were women
Cho 2011	is not a RCT
Clarke 2011	No data about gender were given; obese participants
Cox 1996	No women were included
de Wilde 1991	Only patients with histopathological and clinical diagnosis of appendicitis were included. The outcome was adhesion formation after open or laparoscopic appendectomy
Eichen 1994	Only 63% of the sample were women
Frazee 1994	Only 52% of the sample were women
Goudar 2011	No data about gender were given for analysis
Hansen 1996	Only 65% of the sample were women
Hart 1996	Only 38% of the sample were women
Hebebrand 1994	Only 53% of the sample were women
Heikkinen 1998	Only 48% of the sample were women
Hellberg 1999	No data about gender
Helmy 2001	Only males were included
Henle 1996	Only 51% of the sample were women
Huang 2001	Only 45% of the sample were women
Ignacio 2004	Only males were included
Kald 1999	Only 50% of the sample were women
Kaplan 2009	No data about gender were given
Karadayi 2003	Only 43% of the sample were women
Kargar 2011	No data about gender in the analysis
Kazemier 1997	Only 45% of the sample were women
Khalil 2013	No data about gender in the analysis
Koluh 2010	No data about gender in the analysis
Kouhia 2010	Only patients with confirmed appendicitis
Kum 1993	Only 69% of the sample were women
Lavonius 2001	Only children were included
Lejus 1996	Only children were included
Lintula 2004	Only children were included
Little 2002	Only children were included
Long 2001	No data about gender given
Macarulla 1997a	57% of the sample were women
Martin 1995	Only 41% of the sample were women
McAnena 1992	Only 57% of the sample were women
Meynaud‐Kraemer 1999	This is a meta‐analysis of RCTs in order to evaluate wound infection after open or laparoscopic appendectomy
Minne 1997	Only 38% of the sample were women
Moirangthem 2008	No data about gender given for analysis
Mutter 1996	Only men were included
Nordentoft 2000	No data about gender given
Ortega 1995	Only 29% of the sample were women
Ozmen 1999	Only 54% od the sample were women
Pedersen 2001	Only 53% of the sample were women
Perner 1999	Only 73% of the sample were women, no clinical outcomes
Reiertsen 1997	Only 32% of the sample were women
Schietroma 2007	Only 56% of patients were women. An unstated percentage of patients were older than 45 years old
Schippers 1994	58% of the sample were women
Settmacher 1995	56% of the sample were women
Sezeur 1997	Only 31% of the sample were women
Shirazi 2010	Alternate randomization; no gender analysis
St Peter 2011	children < 18 with perforated appendictis
Stare 1998	53% of the sample were women
Tate 1993	Only 39% of the sample were women
Tzovaras 2010	Only in men
Vallribera 2003	34% of the sample were women
Wei 2010	Only patients with confirmed appendicitis were included
Williams 1996	Only 24% of the sample were women
Witten 1998	41% of the sample were women
Yeung 1997	No data about gender given
Zaninotto 1995	It is a non‐randomised clinical trial. Patients were allocated according to the ability of surgeon on duty to perform laparoscopy
Zhang 1998	41% of the sample were women